Auger-bit



(NoModeL) O. H. IRWIN.

v AUGER BIT.

No; 404,197. Patented May 28, 1889.

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UNITE STATES PATENT OFFICE.

CHARLES H. IRWVIN, OF \VILMINGTON, OHIO.

AUGER-BIT.

SPECIFICATION forming part of Letters Patent No. 404,197, dated May 28, 1889.

Application filed October 20, 1887. Serial No. 252,935. 7 (No model.)

To aZZ whom it may concern.-

Be it known that I, CHARLES H. IRWIN, a citizen of the United States, residing at \Villnington, in the county of Clinton, State of Ohio, have in vented certain Improvements in Auger-Bits, of which the following is a specification, reference being had to the accompanying drawings.

My invention is designed as an improvement upon the auger-bit shown and described in Letters Patent No. 361,522, granted to me on the 19th day of April, 1887, in order to render the operation thereof more secure and efficient.

In the accompanying drawings, Figure 1 is a View of the bit in a vertical position from the side on which the outlining-lip is located. Fig. 2 is a top view, and Fig. 3 is aview taken from the opposite side of the bit from that shown in Fig. 1.

My invention consists in a solid center stem, 13, around which is formed a convoluted blade, 0, the latter terminating in a sharp-cutting floor-lip, b. The central stem, B, terminates in the ordinary screw-point, E, as shown. Just below the screw portion of the stem I have provided'a short convoluted blade, D, which preferably extends about half-way around the stem, as shown. This short blade terminates in a floor-lip,b and an outline-cutting lip, b, on the opposite side of the stem from the lip 11. The body of the outline or spread lip 1) preferably extends out beyond and beneath the lip 12 as shown.

In use the lip b cuts and outlines the hole to be bored, while the floor-lip 1) follows, lifting out the chips, the floor-lip I) being used only in case the lip 12 should become broken or disabled, as said latter lip is on a line slightly elevated above lip b steady the bit in its operation.

The object sought to be attained by having the outline-lip b on the short blade is to As before stated, the lip 1) cuts the outline of the hole, while the floor-lip b, on the opposite side the stem, cuts and lifts the chips. the center stem are thus more or less equalized.

In case the lip I) should from any cause become broken or disabled, the bit would still be operative by the aid of the floor-lip b but in this case the strain would not be so equally divided.

The advantages of my improved bit have been set forth, and consist in the additional means of security and for equalizing the strain on the center stem.

What I claim as new, and desire to secure by Letters Patent, is V 1. In a central-stem auger-bit, the central stem, B, having a convoluted blade, O, terminating in a floor-lip, b, and a short convoluted blade, D, terminating in a floor-lip, b and an outline-lip, b, the latter extending out beyond and below the floor-lip 6 substantially as set forth.

2. In a central-stem auger-bit, the central stern terminating in a screw-point and provided with a convoluted blade, 0, terminating in a floor-lip, b, and a short convoluted blade, D, terminating in a floor-lip, b and an outline-cutting lip, 19, the latter extending out beyond and below the floor-lip b the cuttingedge of lip I) being elevated above the lip b substantially as set forth.

CHARLES H. IRWIN.

Witnesses:

JNo. W. STREHLI, PHILIP ROETTING, Jr.

The strains 011 

